Inspection door



' Oct. l, 1929. M. LiPTAK 1,729,948

` INSPECTION DOOR" Filed sept. 17, 1928 3 Sheets-Sheet 2 /5 l .A l/M/c/mfz. L/PTAK M, 09W@ www.

Oct. l1, 1929.

M. LIPTAK INSPECTION DOOR Filed Sept. l7, 1928 3 Sheets-Sheet 3 Afra/zzz for Patented Oct. 1, 1929 inzage MICHAEL LIPTAK, 0F ST. PAUL, MINNESOTA INSPECTION DOOR Application led September 17, 1928.A Serial No. 306,544.

This invention relates to improvements in inspection doors for furnaces.

The invention is particularly concerned with a cover for the inspection opening of a furnace wall structure which cover in turn has an inspection opening, either registered or registrable with the inspection opening of the wall.

Broadly an obj ect is to pro-vide a transparent guard which is always arranged in opposition to the inspection opening when the door or slide is arranged'for inspection. In

other words, the glass or equivalent element is interposed in .the line of vision, to protect the observer against heat and explosive gases or flame, that is, against flares of any kind.

Glass is used and is of such color as to afford protection to the eyes of the attendant.

There is no intention to be limited to details of construction, although all these details are claimed.

Another object is to pro-vide a transparent guard which is mounted in a manner to al- Y ways be in overlap-ping opposition to both ff openings when the openings are registered for inspection, which is spaced outwardly from the inspection openings, and which is eX- tended upwardly sufficiently to protect the face of an observer against flame or ygas flares.

5? Features of the invention include all the details of construction.

Features and advantages of the invention will be set forth in the description of .the drawings forming a part of the application 'f and in said drawings: v

Figure l is a horizontal section showing the invention applied, and showing the inspec-K.

tion openings in register;

Figure 2 is a view similar to Figure 1 but showing the inspection openings out of register;

Figure 3 is a vertical section through the guide illustrating the formation ofthe slide to permit its removal;

Figure 4 is a vertical section on line 4-4 of Figure l;

Figure 5 is a general perspective view with the inspection openings in register;

Figure 6 is a detail perspective view of the Slide;

Figure 7 is a detail perspective view of the face` and supporting plate;

Figure 8 isa horizontal sectional view of a modification showing the inspection openings n 4wall of a furnace, or equivalent structure;

The inspection opening, is indicated at 2, and is in this instance formedin a block 3 which is composed of t-he upper and lower sections and 'forms a part of the furnace wall structure.k A cover for they inspection opening is `indicated at 10, and is `in turn provided with an inspection opening 11 registralole with the opening 2 of the wall in a manner to protect it from furnace heat. The element 10 may have the form* of a door but is 'herein considered a face or mounting plate. The construction of the block and the manner of connecting the plate or cover l0, forms no part of the present invention'but is described and claimed in a copending application, Serial No. 350,6427 March 28,1929.

rlhe vblock 3 is provided in its outer face with a groove l5, see Figure 4, which circumscribes the opening2. Extension` grooves or pockets 16 are provided, see Figures l and 2, which have the configuration shown, and these lead inwardly from the first mentioned groove, in this instance only from the vertical portions of the circumscriloing groove l5. The element 10 is provided with an inwardly extending in this instance marginal, bead indicated at 20, seeFigures 4 and 7. Integral with this bead and as extensions of the same are anchoring elements indicated at 21,'each of which has a lateral lug 22. There are two of theseextensions at each opposite vertical side of the plate 10, see Figure 7. After fillingthe grooves with'cement the plate lO is pressed to the position shown, so that the t bead and rfrueher elements; are imbedded.

Tlfflliatever the manner of attachment of the plate l and whatever the structure of the plate, whether a door or a slide, it functions herein as a support and facing. Referring 'to Figure T, the support 10 is provided with two horizontally arranged parallel guides or grooves 25, which are opposingly related. These guides may be oi any preferred form and receive a slide plate 30, see Figures 3 and G. A feature of the inventionfis the arrangement, whereby this slide can be detached 'trom the grooves or guides, whereby the whole structure can be formed by 'castinm rhe plate 30 at the bottom is notched or grooved as at 3l to provide stops respectively indicated at 32-33. Each stop is beveled at its inner side as at 34. lThese stops not only limit the movement of the door in each direction, but when the stop 33 is engaged as in Figure 3, the slide cannot tilt in the guides, because of the engagement ot the beveled surfaces with corresponding beveled surfaces 34a, ot the guide 25. When the slide is atone limit position the inspection opening 35 is in register with the inspection openings 2 and 11, see also F ig-ure 2 for a corresponding position of' the door, when the slide is closing the inspection openings 11 and 2. Stop 33 limits the slide in closing positi-on.

ln order that the slide may be easily detached from the guides 25 the upper edge 1s formed as at 36, to convergently taper toward the lower side of the slideA in a direction of closing movement of the door. Thus when the door is closed, the upper" portion 37 thereof cooperates with the guide to prevent rattling o't the door and to hold it against rocking motion in a vertical plane. The guides 25 are so constructed that there is a snug lit between the engaging surfaces of slide and plate l0. These are features of the invention, as well as the arrangement of the parts so that they can be cast and yetcan be quickly assembled and disassembled. A peep opening 38 is provided in the element 30.

By reference to Figure 3, it will be seen that the cooperative beveled portions 34, 34 prevent tilting motion ot the slide, when the inspection openings are in register. It it is desired to remove the slide `from its guides 25 it is only necessary to move the slide a very short distance to the lett to disengage the beveled porti-ons, after which the slide can be tilted so that the stop is ine'ttective, and so that the slide, by movement in the opposite direction, can be disengaged from the guides. This is a feature of the invention which permits guides and slide to be separately cast andthen assembled, a very cheap construction. TWhen the slide is moved to closed posi tion the bevel 34 ot the stop 33 will cooperate with the bevel 34, and the portion 37 of the upper edge of the slide will snugly engage the opposed portion of the guide to prevent tilting. `Vlhen the slide is the position just described, the peepbpening 38 will be opposed to the inspection opening.

Another feature ot' the invention, as before stated, includes the sheet of transparent inaterial 40 or its equivalent, mounted in overlapping opposition to and spaced outwardly from the inspection opening 35 oi' the slide to provide tor circulation of air, and extended upwardly suiiiciently to protect the tace et' an observer against llame or gas iiares. For these general purposes, a window frame 42 is provided which is open at its top side, see Figure 6, and which is provided with a groove 43 continuous on three inner sides of the `frame. This frame is in this instance attached to and movable with the slide 30, although kit can be attached .to the plate 20, as shown in Figures 8 to 11. The groove provides a convenient means for attaching the guard, inasmuch as it maybe simply dropped into position, as a kind of slide. In Figure 4 the upward vextension ot the glass element 40, and the relation of the element to the opening 35 is clearly shown. It will be noted that the element 40 is spaced outwardly from the opening 35 to provide a cooling or air circulating space, which will prevent breakage of the glass by heat. The :trame 42 is therefore supported only by the elements 45, so that a vertical circulation of air is obtained, and thus circulation can be increased by providing openings in the elements 45. This is a feature of the invention.

Another embodiment of the invention is shown in Figures 3 to il. The connection of the plate 10a in this case to the wall or block insert is substantially the same as in the first case 'so that no further description is deemed necessary. A feature of ,this form of the invention, is that the transparent guard elementis constantly arranged in opposition to the inspection opening,andA its support pron vides guides and also a support for a slide door which can be moved independently of the lfmard, so that the inspection opening ot the slide can be brought into registration with the openings 11 and with the transparent guard 40. Y

Features of this form of the invention not only include the immovable relation ot the transparent guard in relation to the openings 11 and 2, but also include the arrangement of the slide which is support-ed by the support tor the guard, along with the feature whereby the slide assumes a wedged relation in closure position, to prevent rattling and to sealingly close the inspection opening.

The support for the transparent element comprises a pair ot plates or arms generally indicated at 50, and formed as integral eX- tensions of the plate 10a. Each plate has a horizontal air circulating opening 5l therein which lies nearer the opening l1 than the transparent element 40. Moreover vertical circulation of air is provided tor between the slide.

element i0 and the opening 11. Each plate is provided with a groove 52 open at the top and closed at the bottom to form a stop as best shown in Figure 10. In this instance as in the first forni of the invention the element e() can be dropped into position. Although it has not been shown as extending upwardly beyond the top of the arms` it will be understood that it may be.

The structure herein also lends itself to cast-ing, the elements beingintegral with the element 10a'. A slide opening or slot eX- tends through each plate 50 and these openings are respectively indicated at 55-56 and are aligned in direction of slide movement. A slide or door is indicated at and is provided with an inspection opening 61. The door is freely slidable in the openings or slots 55-56 of the extensions 50.

A feature of the invention is the arrangement of wedges for causing the faces of slide and plate l()a to tightly engage when the door is closed. A pair of tapering ribs are indi'.y cated at and extend lengthwise of the These ribs are convergently tapered in direction of closing movement of the door, and the grooves 55-56 respectively have depressions 66-67 which receive these ribs, as best shown in Figures 9 and 10. The slide is limited in its opening movement by a detachable stop 70, which ordinarily acts to prevent urther movement of the slide after the opening 61 is in register with the opening l1. Then the slide is closing the opening 11 the wedge-shaped ribs are acting to press the rear face of the plate against the front surface of the element 10, see Figures 8, 10 and 11.

I claim as my invention:

1. In combination, a face plate having an opening and having guides, a slide arranged in the guides and having an opening registrable with the face plate opening when the slide is in one limit position, said slide having stops which engage the guide to limit movement of the slide in opposite directions, and said guide and lower edge of said slide having means cooperative to prevent tilting of the .slide in a vertical plane when at either limit position.

2. In combination with a furnace wall structure including an inspection opening, a face plate having an opening in register with said inspection opening, and having guides, a slide arranged in the guides and having an opening and a frame, and a sheet of transparent material arranged in the frame in outwardly spaced relation to the opening of the slide, whereby whenever the opening of the slide is registered with that of the inspection opening, the transparent material will always lie in opposition to bothx openings.

3. In combination with a furnace wall structure including an inspection opening, a

face plate having an opening registered with the inspection opening, and having guides, a slide arranged in the guides and having an opening registrable with the face plate opening when the slide is in one limit position, saidy slide having its'lower edge notched to provide stops which engage the guide to limit movement of the slide in opposite directions, and said guide and stops being c0- operative to prevent tilting of the slide in a vertical plane when at either limit position, those edges of the slide which engage the guides being convergent in direction of closing movement, to permit the slide to be tilted ina vertical plane sufliciently to prevent stop action and therefore permit removal of the slide from its guides 0n continued motion in the samedirection. f

4.' In combination, a faceplate having an opening and having guides, a slide arranged in the guides andhaving an opening registrable with the face plate openingthe slide having stops which are arranged to engage the guide, to limit motions in opposite directions, said stops and guide beingso formed as to cooperate to preventvtilting movements of the slide in direction toward the guides.

5. In combination, a face plate having an opening and having guides, a slide arranged infthe guides and having an opening registrable with the face plate opening, the slide having stops which 'are arrangedto engage the guide, to limit motion in opposite directions, said stops and guide being so formed as to cooperate to prevent tilting movements of the slide in direction. toward the guides, and the guides and slide being so related that the slide can be tilted sufficiently tov prevent operation of'one of the stops, to permit ycomplete separation of slide from guides.

i. l6. In combination with a furnace ywall structure including an inspection opening, a slide having an inspection opening registrable with the inspection opening of the wall and having a portion adapted' to close the inspection opening of said wall, and a'sheet of transparent-material supported in opposition to the opening of the slide, in .a manner to always be in opposition to both openings when registered.

, 7. In combination with a furnace wall structure including an inspection opening, a slide having an inspection opening, registrable with the inspection opening of the Wall, and having a portion adapted to close the inspection opening of said wall, and a sheet of transparent material spaced outwardly from and supported in a manner to always be in opposition to both openings when registered.

8. In combination with a furnace wall structure including an inspection opening, a slide having an inspection opening registrable with the inspection opening of the wall and having a portion adapted to close the inspection opening of said wall, and a sheet of transparent material spaced outwardly from and supported in a manner to always be in opposition to both openings when registered, the transparent material being arranged to permit the circulation of a relatively large volume of air between said transparent material and the opening of theJ slide.

9. In combination, a face plate having an inspection opening and guides, a slide mounted in the guides and adapted to close the opening, and having an opening registrable with that of the face plate, said slide having stops which engage to limit themovement of the slide in opposite directions, respectively when closing the face plate opening and when the openings of slide and face plate are in registration, the slide being formed to permit its translative withdrawal from the guides after a tilting motion, and said slide having means cooperative with the face plate to prevent tilting of the slide in a vertical plane when at either limit position.

10. In combination with a furnace wall structure including an inspection opening, a slide adapted to substantially sealingly close the inspection opening, and having an opening registrable with that of the inspection opening, and a sheet of glass spaced outwardly from the slide in opposition to the slide opening, so that whenever the opening of the slide is registered with that of the inspection opening of the wall, the transparent material will always lie in opposition to both openings, and a support for said glass, said support being constructed to permit free circulation of air between the glass and outer surface of the slide.

11. In combination with an inspection opening, a movable closure for the opening having an opening adapted to register with the inspection opening for one position of said closure, and a sheet of transparent material supported in a manner to always be in opposition to both openings when registered.

In witness whereof, I have hereunto set my hand this 14th day of September 1928.

MICHAEL LIPTAK. 

